Here is another robot kit that helps you run your own experiments. The Leo Rover 4WD Developer Kit is based on Raspberry Pi. It has a payload capacity of 5kg. It has a waterproof case for outdoor use. This rover has 4 in-hub DC motors. It drives on 4 x 130mm wheels.
This robot can overcome obstacles up to 70mm. It comes with live video streaming capability. It has a 5MP camera with a 170-degree field of view. It lasts up to 4 hours on battery.